Centering guide for a portable drill



FIG. 1 is a perspective view of the centering guide for a portable drill showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a side elevational view thereof, the opposite side being a mirror image; and

FIG. 5 is an end elevational view thereof, the opposite end being a mirror image. 

The ornamental design for a centering guide for a portable drill, as shown and described. 